77 lines
2.4 KiB
JavaScript
77 lines
2.4 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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* http://creativecommons.org/publicdomain/zero/1.0/ */
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//
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// Basic node example that prints document metadata and text content.
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//
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// Run `gulp dist-install` to generate 'pdfjs-dist' npm package files.
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const pdfjsLib = require("pdfjs-dist/legacy/build/pdf.js");
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// Loading file from file system into typed array
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const pdfPath =
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process.argv[2] || "../../web/compressed.tracemonkey-pldi-09.pdf";
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// Will be using promises to load document, pages and misc data instead of
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// callback.
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const loadingTask = pdfjsLib.getDocument(pdfPath);
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loadingTask.promise
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.then(function (doc) {
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const numPages = doc.numPages;
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console.log("# Document Loaded");
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console.log("Number of Pages: " + numPages);
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console.log();
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let lastPromise; // will be used to chain promises
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lastPromise = doc.getMetadata().then(function (data) {
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console.log("# Metadata Is Loaded");
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console.log("## Info");
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console.log(JSON.stringify(data.info, null, 2));
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console.log();
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if (data.metadata) {
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console.log("## Metadata");
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console.log(JSON.stringify(data.metadata.getAll(), null, 2));
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console.log();
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}
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});
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const loadPage = function (pageNum) {
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return doc.getPage(pageNum).then(function (page) {
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console.log("# Page " + pageNum);
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const viewport = page.getViewport({ scale: 1.0 });
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console.log("Size: " + viewport.width + "x" + viewport.height);
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console.log();
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return page
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.getTextContent()
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.then(function (content) {
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// Content contains lots of information about the text layout and
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// styles, but we need only strings at the moment
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const strings = content.items.map(function (item) {
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return item.str;
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});
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console.log("## Text Content");
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console.log(strings.join(" "));
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// Release page resources.
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page.cleanup();
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})
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.then(function () {
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console.log();
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});
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});
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};
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// Loading of the first page will wait on metadata and subsequent loadings
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// will wait on the previous pages.
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for (let i = 1; i <= numPages; i++) {
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lastPromise = lastPromise.then(loadPage.bind(null, i));
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}
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return lastPromise;
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})
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.then(
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function () {
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console.log("# End of Document");
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},
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function (err) {
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console.error("Error: " + err);
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}
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);
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